Magnetic alloy



others, alloys composed as follows Patented Feb. 11,1930

UNITED STATES PATENT? OFFICE,

WILLOUGHBY STATHAM SMITH, OF BENCHAMS; NEWTON POPIPLEFORD, AND HENRYJOSEPH GARNETT, SEVENOAKS, ENG-LAND MAGNETIC ALLOY No Drawing.Application filed May 7, 1927, Serial No'. 189,735, and in Great BritainJuly 27, 1926.

Inthe Patent No. 1,552,769 a number of alloyswith high permeability withvery Weak magnetizing forces were described; amongst No.1 No.2 Nickel70.5% Iron 18.5% 17% Copper 10.5% 17% Manganese 0.5% 0.5%

The first alloy had a magnetic permeability of 5300, and the secondamagnetic permeability of 3200 in magnetic fields tending to zero.

According to this invention an alloy is composed of:

Nickel 69-71% Copper -1 14-16% Nickel 70% Iron 15% Copper 15% The alloyhas properties, therefore which make it, me tape or wire form, veryuseful for-'themanufaeture of loaded telegraphic and telephonic cables.

What we claim is 1. A magnetic alloy comprising iron from 14 to-l5%,copper from 1 1 to 16% and the remainder nickel, which has an initialmag.

netic permeability of the order of 6000 which permeability issubstantially constant for various strengths of the magnetizing field.

2. A magnetic allo comprising iron from 14 to 15%, copper trom 14: to16%, a deoxidizing metal to an amount not greater than 0.5 and theremainder nickel which has an initial magnetic permeability of the orderof 6000 which permeability is substantially constant for variousstrengths of the mag netizing field.

, 3. A magnetic alloy comprising iron 15%, copper 15 and the remaindernickel,v which has an initial magnetic permeability of the order. of6000 which permeability is substantially constant for various strengthsof the magnetizing field.

1. A magnetic alloy comprising iron 15%," copper 15%, manganese to anamount not greater than 0.5% .and the remainder nickel; which has aninitial permeability of the on der of 6000 which permeability is substantially constant for various strengths of the magnetizing field.

In testimony that we claim the foregoing as our invention we have signedour names U this twenty-fifth day of April, 1927.

"WILLOUGHBY STATHAM SMITH. HENRY JOSEPH GARNETT.

To the alloy may be added manganese irf quantities of less than .5% asdeoxidizer, but

should not contain any trace ofcarbona

